The recent observational data indicate that the universe is almost spatially flat. Nevertheless, the open inflationary scenario is attracting a renewed interest in the context of string landscape. Since there are a large number of metastable de Sitter vacua in string landscape, tunneling transitions to lower metastable vacua through the bubble nucleation occur quite naturally, which leads to a natural realization of open inflation. Recently, it was argued anthropically that string landscape would lead to an estimate of the density parameter in the range Ω0 ≈ 0.998 ∼ 0.9996. Although the deviation of Ω,0 from unity, the effect of this small deviation on the CMB anisotropies might be significant. If their estimate of the value of Ω0 is correct, although yet there is no consensus about the problem of the probability measure, we might be able to discriminate the string landscape scenario from others. We argue that although the deviation of Ω0 from unity may be small, the effect of this small deviation on the large angle CMB anisotropies may be significant for large angle mode in tensor-type perturbation. We found that the large amplification of power spectrum occurs when the difference of false and true vacuum potential energy is exponentially large.
|Publication status||Published - 2008 Dec 1|
|Event||18th Workshop on General Relativity and Gravitation in Japan, JGRG 2008 - Higashi-Hiroshima, Japan|
Duration: 2008 Nov 17 → 2008 Nov 21
|Other||18th Workshop on General Relativity and Gravitation in Japan, JGRG 2008|
|Period||08/11/17 → 08/11/21|
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics